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Elliott K, Caicedo PA, Haunerland NH, Lowenberger C. Profiling lipidomic changes in dengue-resistant and dengue-susceptible strains of Colombian Aedes aegypti after dengue virus challenge. PLoS Negl Trop Dis 2023; 17:e0011676. [PMID: 37847671 PMCID: PMC10581493 DOI: 10.1371/journal.pntd.0011676] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2023] [Accepted: 09/20/2023] [Indexed: 10/19/2023] Open
Abstract
The mosquito Aedes aegypti is the primary vector for all four serotypes of dengue viruses (DENV1-4), which infect millions across the globe each year. Traditional insecticide programs have been transiently effective at minimizing cases; however, insecticide resistance and habitat expansion have caused cases of DENV to surge over the last decade. There is an urgent need to develop novel vector control measures, but these are contingent on a detailed understanding of host-parasite interactions. Here, we have utilized lipidomics to survey the profiles of naturally DENV-resistant (Cali-MIB) or susceptible (Cali-S) populations of Ae. aegypti, isolated from Cali, Colombia, when fed on blood meals containing DENV. Control insects were fed on a DENV-free blood meal. Midguts were dissected from Cali-MIB and Cali-S females at three time points post-infectious blood meal, 18, 24 and 36h, to identify changes in the lipidome at key times associated with the entry, replication and exit of DENV from midgut cells. We used principal component analysis to visualize broad patterns in lipidomic profiles between the treatment groups, and significance analysis of microarray to determine lipids that were altered in response to viral challenge. These data can be used to identify molecules or metabolic pathways particular to the susceptible or refractory phenotypes, and possibly lead to the generation of stable, DENV-resistant strains of Ae. aegypti.
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Affiliation(s)
- Keenan Elliott
- Simon Fraser University, Department of Biological Sciences, C2D2 Research Group, Burnaby, British Columbia, Canada
| | - Paola A. Caicedo
- Universidad Icesi, Natural Science Faculty, Department of Biology, Cali, Colombia
| | - Norbert H. Haunerland
- Simon Fraser University, Department of Biological Sciences, C2D2 Research Group, Burnaby, British Columbia, Canada
| | - Carl Lowenberger
- Simon Fraser University, Department of Biological Sciences, C2D2 Research Group, Burnaby, British Columbia, Canada
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David-Jimenez SA, Caicedo PA, Villegas-Torres MF, Campillo-Pedroza N. Detecting SARS-CoV-2 Virus by Reverse Transcription-Loop-mediated Isothermal Amplification. J Vis Exp 2023. [PMID: 37747227 DOI: 10.3791/65662] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/26/2023] Open
Abstract
The severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) virus has dramatically impacted human health. It continues to be a threat to modern society because many people die as a result of infection. The disease is diagnosed using serologic and molecular tests, such as the gold standard real-time polymerase chain reaction (RT-PCR). The last has several disadvantages because it requires specialized infrastructure, costly equipment, and trained personnel. Here, we present a protocol outlining the steps required to detect the SARS-CoV-2 virus using reverse transcription-loop-mediated isothermal amplification (RT-LAMP) in human samples. The protocol includes instructions for designing primers in silico, preparing reagents, amplification, and visualization. Once standardized, this method can be easily implemented and adapted to any laboratory or point-of-care within 60 min at a low cost and using inexpensive equipment. It is adaptable to detecting different pathogens. Thus, it can potentially be used in the field and in health centers to carry out timely epidemiological surveillance.
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Affiliation(s)
| | - Paola A Caicedo
- Facultad de Ingeniería, Diseño y Ciencias Aplicadas, Universidad Icesi;
| | - Maria F Villegas-Torres
- Facultad de Ingeniería, Diseño y Ciencias Aplicadas, Universidad Icesi; Centro de Investigaciones Microbiológicas (CIMIC), Department of Biological Sciences, Universidad de los Andes
| | - Natalia Campillo-Pedroza
- Facultad de Ingeniería, Diseño y Ciencias Aplicadas, Universidad Icesi; BioDx: Diagnóstico y Soluciones Biotecnológicas S.A.S, Universidad Icesi
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3
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Bedoya-Joaqui V, Gutiérrez-López MI, Caicedo PA, Villegas-Torres MF, Albornoz-Tovar LL, Vélez JD, Hidalgo-Cardona A, Tobón GJ, Cañas CA. Persistent and fatal severe acute respiratory syndrome coronavirus 2 infection in a patient with severe hypogammaglobulinemia: a case report. J Med Case Rep 2023; 17:194. [PMID: 37173711 PMCID: PMC10181880 DOI: 10.1186/s13256-023-03917-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2022] [Accepted: 03/29/2023] [Indexed: 05/15/2023] Open
Abstract
BACKGROUND Viruses are constantly changing as a result of mutations, and new viral variants are expected to appear over time. The virus that causes coronavirus disease 2019, severe acute respiratory syndrome coronavirus 2, is not excluded from this condition. Patients with some types of immunodeficiency have been reported to experience symptoms that vary from mild to severe, or even death, after being infected with severe acute respiratory syndrome coronavirus 2. We report a case of a woman with severe hypogammaglobulinemia who developed a prolonged and fatal severe acute respiratory syndrome coronavirus 2 infection. CASE PRESENTATION A 60-year-old mestizo female with a previous history of severe hypogammaglobulinemia manifested by recurrent pulmonary infections and follicular bronchiolitis. She received a monthly treatment of intravenous immunoglobulins and was admitted after report of a neurological manifestation related to a left thalamic inflammatory lesion, for a duration of 2 weeks of hospitalization, indicated for the study of her neurological condition, including brain biopsy. Both on admission and 1 week later, nasopharyngeal polymerase chain reaction tests for severe acute respiratory syndrome coronavirus 2 were performed and reported negative. In the third week of hospitalization, she developed pulmonary symptoms, and a positive test result for severe acute respiratory syndrome coronavirus 2 was evidenced. On Day 3, the patients' condition worsened as the infection progressed to respiratory failure and required mechanical ventilation. On Day 8 after the coronavirus disease 2019 diagnosis, the polymerase chain reaction test for severe acute respiratory syndrome coronavirus 2 showed persistent detection of the virus. Various bacterial coinfections, including Klebsiella pneumoniae and Enterobacter cloacae, were diagnosed and treated. On Day 35, her pulmonary symptoms worsened, and the results of the severe acute respiratory syndrome coronavirus 2 polymerase chain reaction test remained positive. On Day 36, despite all the respiratory support, the patient died. The severe acute respiratory syndrome coronavirus 2 virus was sequenced at the beginning and 8 days after the onset of the disease, and the strain, without obvious mutations in the gene that encodes spike protein, was identified. CONCLUSIONS This clinical case showed persistent severe acute respiratory syndrome coronavirus 2 detection after 35 days of infection in a patient with severe hypogammaglobulinemia. The sequencing of the virus showed no mutations on the spike protein at 8 days, indicating that, in this case, the persistence of the viral detection was associated with immunodeficiency instead of changes in the viral components.
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Affiliation(s)
- Vanessa Bedoya-Joaqui
- Departamento de Medicina Interna, Unidad de Reumatología, Universidad Icesi, Facultad de Ciencias de la Salud, 760031, Cali, Colombia
| | - María I Gutiérrez-López
- Departamento de Biología, Universidad Icesi, Facultad de Ciencias de la Salud, 760031, Cali, Colombia
| | - Paola A Caicedo
- Departamento de Biología, Universidad Icesi, Facultad de Ciencias de la Salud, 760031, Cali, Colombia
| | - María F Villegas-Torres
- Departamento de Biología, Universidad Icesi, Facultad de Ciencias de la Salud, 760031, Cali, Colombia
- Centro de Investigaciones Microbiológicas, Departamento de Ciencias Biológicas, Universidad de los Andes, 111711, Bogotá, Colombia
| | | | - Juan D Vélez
- Unidad de Infectología, Fundación Valle del Lili, 760032, Cali, Colombia
| | | | - Gabriel J Tobón
- Department of Medical Microbiology, Immunology and Cell Biology, Southern Illinois University School of Medicine, Springfield, IL, 62794-9620, USA
| | - Carlos A Cañas
- Departamento de Medicina Interna, Unidad de Reumatología, Universidad Icesi, Facultad de Ciencias de la Salud, 760031, Cali, Colombia.
- Unidad de Reumatología, Fundación Valle del Lili, Cra.98 No. 18-49, 760032, Cali, Colombia.
- CIRAT: Centro de Investigación en Reumatología, Autoinmunidad y Medicina Traslacional, Universidad Icesi, 760031, Cali, Colombia.
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Serrato IM, Moreno-Aguilera D, Caicedo PA, Orobio Y, Ocampo CB, Maestre-Serrano R, Peláez-Carvajal D, Ahumada ML. Vector competence of lambda-cyhalothrin resistant Aedes aegypti strains for dengue-2, Zika and chikungunya viruses in Colombia. PLoS One 2022; 17:e0276493. [PMID: 36282839 PMCID: PMC9595557 DOI: 10.1371/journal.pone.0276493] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2021] [Accepted: 10/07/2022] [Indexed: 11/18/2022] Open
Abstract
Aedes aegypti is the primary vector of dengue, Zika, and chikungunya viruses. Studies have shown that insecticide resistance affects vector competence (VC) of some mosquito species. This study evaluates the effect of resistance to lambda-cyhalothrin and kdr V1016I mutation genotypes on the VC of Ae. aegypti strains for DENV-2, ZIKV, and CHIKV. Three Ae. aegypti strains with gradual lambda-cyhalothrin resistance (susceptible, resistant, and highly resistant) were infected with DENV-2, ZIKV, and CHIKV. Individual mosquitoes were tested to detect virus infection in the abdomen and head-salivary glands, using RT-PCR, and genotypes for V1016I mutations using allele-specific PCR. Recorded VC variables were midgut infection rate (MIR), dissemination rate (DIR), and dissemination efficiency (DIE). Lambda-cyhalothrin resistance affects differentially VC variables for ZIKV, DENV-2, and CHIKV. For ZIKV, an apparent gradual increase in DIR and DIE with the increase in insecticide resistance was observed. For DENV-2 the MIR and DIE were higher in insecticide resistant strains. For CHIKV, only MIR could be evaluated, this variable was higher in insecticide resistance strains. The presence of kdr V1016I mutation on mosquito resistant strains did not affect VC variables for three study viruses.
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Affiliation(s)
- Idalba M. Serrato
- Grupo de Entomología, Instituto Nacional de Salud, Bogotá, D.C., Colombia
- Fundación Salutia, Bogotá, D.C., Colombia
| | - Diana Moreno-Aguilera
- Grupo de Entomología, Instituto Nacional de Salud, Bogotá, D.C., Colombia
- Fundación Salutia, Bogotá, D.C., Colombia
| | - Paola A. Caicedo
- Natural Science Faculty, Universidad Icesi, Cali, Valle del Cauca, Colombia
| | - Yenifer Orobio
- Epidemiology and Biostatistics Unit, Centro Internacional de Entrenamiento e Investigaciones Médicas-CIDEIM, Cali, Colombia
| | - Clara B. Ocampo
- Vector, Biology and Control Unit. Centro Internacional de Entrenamiento e Investigaciones Médicas-CIDEIM, Cali, Colombia
- Dirección de Vocaciones y Formación, Ministerio de Ciencia y Tecnología e Innovación, Minciencias, Bogotá, D.C., Colombia
| | - Ronald Maestre-Serrano
- Facultad de Ciencias de la Salud, Universidad Simón Bolívar, Barranquilla, Atlántico, Colombia
| | | | - Martha L. Ahumada
- Grupo de Entomología, Instituto Nacional de Salud, Bogotá, D.C., Colombia
- * E-mail:
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Coatsworth H, Caicedo PA, Winsor G, Brinkman F, Ocampo CB, Lowenberger C. Transcriptome comparison of dengue-susceptible and -resistant field derived strains of Colombian Aedes aegypti using RNA-sequencing. Mem Inst Oswaldo Cruz 2021; 116:e200547. [PMID: 34076041 PMCID: PMC8186470 DOI: 10.1590/0074-02760200547] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2020] [Accepted: 04/28/2021] [Indexed: 11/30/2022] Open
Abstract
BACKGROUND Forty percent of the world’s population live in areas where they are at risk from dengue fever, dengue hemorrhagic fever, and dengue shock syndrome. Dengue viruses are transmitted primarily by the mosquito Aedes aegypti. In Cali, Colombia, approximately 30% of field collected Ae. aegypti are naturally refractory to all four dengue serotypes. OBJECTIVES Use RNA-sequencing to identify those genes that determine refractoriness in feral mosquitoes to dengue. This information can be used in gene editing strategies to reduce dengue transmission. METHODS We employed a full factorial design, analyzing differential gene expression across time (24, 36 and 48 h post bloodmeal), feeding treatment (blood or blood + dengue-2) and strain (susceptible or refractory). Sequences were aligned to the reference Ae. aegypti genome for identification, assembled to visualize transcript structure, and analyzed for dynamic gene expression changes. A variety of clustering techniques was used to identify the differentially expressed genes. FINDINGS We identified a subset of genes that likely assist dengue entry and replication in susceptible mosquitoes and contribute to vector competence. MAIN CONCLUSIONS The differential expression of specific genes by refractory and susceptible mosquitoes could determine the phenotype, and may be used to in gene editing strategies to reduce dengue transmission.
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Affiliation(s)
- Heather Coatsworth
- Simon Fraser University, Department of Biological Sciences, C2D2 Research Group, Burnaby, BC, Canada
| | - Paola A Caicedo
- Universidad Icesi, Natural Science Faculty, Centro Internacional de Entrenamiento e Investigaciones Médicas, Department of Biology, Vector Biology and Control, Cali, Colombia
| | - Geoffrey Winsor
- Simon Fraser University, Department of Molecular Biology and Biochemistry, Burnaby, BC, Canada
| | - Fiona Brinkman
- Simon Fraser University, Department of Molecular Biology and Biochemistry, Burnaby, BC, Canada
| | - Clara B Ocampo
- Universidad Icesi, Natural Science Faculty, Centro Internacional de Entrenamiento e Investigaciones Médicas, Department of Biology, Vector Biology and Control, Cali, Colombia
| | - Carl Lowenberger
- Simon Fraser University, Department of Biological Sciences, C2D2 Research Group, Burnaby, BC, Canada
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Molina-Henao EH, Graffe MY, De La Cadena E, Serrato IM, Correa A, Romero LV, Caicedo PA, Ocampo CB. Correction to: Culturable microbial composition in the midgut of Aedes aegypti strains with different susceptibility to dengue-2 virus infection. Symbiosis 2019. [DOI: 10.1007/s13199-019-00654-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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7
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Molina-Henao EH, Graffe MY, De La Cadena EP, Serrato IM, Correa A, Romero LV, Caicedo PA, Ocampo CB. Culturable microbial composition in the midgut of Aedes aegypti strains with different susceptibility to dengue-2 virus infection. Symbiosis 2019. [DOI: 10.1007/s13199-019-00646-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Caicedo NH, Davalos AF, Puente PA, Rodríguez AY, Caicedo PA. Antioxidant activity of exo-metabolites produced by Fusarium oxysporum: An endophytic fungus isolated from leaves of Otoba gracilipes. Microbiologyopen 2019; 8:e903. [PMID: 31297981 PMCID: PMC6813440 DOI: 10.1002/mbo3.903] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2019] [Revised: 06/14/2019] [Accepted: 06/18/2019] [Indexed: 12/29/2022] Open
Abstract
Tropical ecosystems hold an extremely diverse array of endophytic fungi, but their potential use still remains to be explored. In this study, we isolated an endophytic fungus from the leaves of Otoba gracilipes, a medicinal tree from a tropical rainforest in Colombia. Following isolation and cultivation, we evaluated its extracellular crude extract for antioxidant activity. Using traditional and molecular methods (ITS1, NL1 regions), the endophyte was identified as Fusarium oxysporum. Fresh spores from the fungal isolate were inoculated in liquid media (potato dextrose broth [PDB] and potato dextrose-yeast extract broth [PDYB]) and centrifuged for recovering extracellular polysaccharides from the exhausted medium after 30 days of cultivation. Crude extracts were recovered, purified, lyophilized, and evaluated for their ability to inactivate the free radical 2,2-diphenyl-1-picrylhydrazyl (DPPH). The extracts obtained from PDB culture media had a 51.5% of scavenging effect on DPPH after 5 min of reaction compared with the extracts from PDBY (26.4%), which suggests a high antioxidant potential of these fungal extracts. Thus, our results suggest other fungi from tropical ecosystems should be explored as potential sources of novel enzymes and other metabolites with bioactivity.
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Affiliation(s)
- Nelson H. Caicedo
- Department of Biochemical Engineering, Engineering FacultyUniversidad IcesiCaliColombia
| | - Andres F. Davalos
- Department of BiologyNatural Science FacultyUniversidad IcesiCaliColombia
| | - Paula A. Puente
- Department of Pharmaceutical Sciences, Natural Science FacusltyUniversidad IcesiCaliColombia
| | - Ana Y. Rodríguez
- Program of Medicine, Health SciencesUniversity UPTCTunjaColombia
| | - Paola A. Caicedo
- Department of BiologyNatural Science FacultyUniversidad IcesiCaliColombia
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9
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Caicedo PA, Serrato IM, Sim S, Dimopoulos G, Coatsworth H, Lowenberger C, Ocampo CB. Immune response-related genes associated to blocking midgut dengue virus infection in Aedes aegypti strains that differ in susceptibility. Insect Sci 2019; 26:635-648. [PMID: 29389079 DOI: 10.1111/1744-7917.12573] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/25/2017] [Revised: 12/19/2017] [Accepted: 01/15/2018] [Indexed: 06/07/2023]
Abstract
Aedes (Stegomyia) aegypti, the principal global vector of dengue viruses, has differences in its susceptibility to dengue virus infection. We compared the global expression of genes in the midguts of Colombian Ae. aegypti dengue-susceptible (Cali-S) and dengue-refractory (Cali-MIB) field derived strains after ingesting either a sugarmeal, a bloodmeal, or a bloodmeal containing dengue virus serotype 2 (DENV-2). Microarray-based transcriptome analysis among treatments indicated a total of 4725 transcripts with differential expression between the two strains. Eleven genes were selected from different functional groups based on their significant up or down expression levels as well as reports in the literature suggesting they are associated with dengue virus elimination. We measured mRNA abundance of these 11 genes at 0, 8, 24, and 36 h postinfection using quantitative real time PCR (qPCR) to confirm the microarray results and assess any temporal patterns. Four genes were selected (Gram-negative binding protein-GNBP [AAEL009176], Niemann Pick Type-C2-NPC2 [AAEL015136], Keratinocyte lectin [AAEL009842], and Cathepsin-b [AAEL007585]) for knockdown experiments using RNA interference (RNAi) methodology to determine the phenotype (DENV-2 susceptible or refractory). Silencing GNBP, Cathepsin-b and Keratinocyte lectin reduced the percentage of mosquitoes with disseminated virus in the Cali-S strain to 8%, 20%, and 12% respectively compared with 96% in the controls. Silencing of NPC2 increased the percentage of mosquitos with disseminated virus infections in Cali-MIB to 66% compared with 35% in the controls. This study provides insight into genes that may contribute to the Cali-S susceptible and Cali-MIB refractory phenotypes in Ae. aegypti.
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Affiliation(s)
- Paola A Caicedo
- Centro Internacional de Entrenamiento e Investigaciones Médicas (CIDEIM), Cali, Colombia
| | - Idalba Mildred Serrato
- Centro Internacional de Entrenamiento e Investigaciones Médicas (CIDEIM), Cali, Colombia
| | - Shuzhen Sim
- W. Harry Feinstone Department of Molecular Microbiology and Immunology, Bloomberg School of Public Health, Johns Hopkins University, Baltimore, Maryland, USA
| | - George Dimopoulos
- W. Harry Feinstone Department of Molecular Microbiology and Immunology, Bloomberg School of Public Health, Johns Hopkins University, Baltimore, Maryland, USA
| | - Heather Coatsworth
- Department of Biological Sciences, Simon Fraser University, Burnaby, Canada
| | - Carl Lowenberger
- Department of Biological Sciences, Simon Fraser University, Burnaby, Canada
| | - Clara B Ocampo
- Centro Internacional de Entrenamiento e Investigaciones Médicas (CIDEIM), Cali, Colombia
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10
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Coatsworth H, Caicedo PA, Van Rossum T, Ocampo CB, Lowenberger C. The Composition of Midgut Bacteria in Aedes aegypti (Diptera: Culicidae) That Are Naturally Susceptible or Refractory to Dengue Viruses. J Insect Sci 2018; 18:5228717. [PMID: 30508201 PMCID: PMC6276830 DOI: 10.1093/jisesa/iey118] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/27/2018] [Indexed: 06/09/2023]
Abstract
The composition, abundance, and diversity of midgut bacteria in mosquitoes can influence pathogen transmission. We used 16S rRNA microbiome profiling to survey midgut microbial diversity in pooled samples of laboratory colonized dengue-refractory, Cali-MIB, and dengue-susceptible, Cali-S Aedes aegypti (Linnaeus). The 16S rRNA sequences from the sugar-fed midguts of adult females clustered to 63 amplicon sequence variants (ASVs), primarily from Proteobacteria, Firmicutes, Flavobacteria, and Actinobacteria. An average of five ASVs dominated the midguts, and most ASVs were present in both Cali-MIB and Cali-S midguts. No differences in abundance were noted at any phylogenetic level (Phylum, Class, Order, Family, Genus) by analysis of composition of microbiome (w = 0). No community diversity metrics were significantly different between refractory and susceptible mosquitoes. These data suggest that phenotypic differences in the susceptibility to dengue virus between Cali-MIB and Cali-S are not likely due to major differences in midgut bacterial communities.
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Affiliation(s)
- Heather Coatsworth
- C2D2 Research Group, Department of Biological Sciences, Simon Fraser University, Burnaby, BC, Canada
| | - Paola A Caicedo
- Centro Internacional de Entrenamiento e Investigaciones Médicas (CIDEIM), Cali, Colombia
| | - Thea Van Rossum
- Department of Molecular Biology and Biochemistry, Simon Fraser University, Burnaby, BC, Canada
| | - Clara B Ocampo
- Centro Internacional de Entrenamiento e Investigaciones Médicas (CIDEIM), Cali, Colombia
| | - Carl Lowenberger
- C2D2 Research Group, Department of Biological Sciences, Simon Fraser University, Burnaby, BC, Canada
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11
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Serrato IM, Caicedo PA, Orobio Y, Lowenberger C, Ocampo CB. Vector competence and innate immune responses to dengue virus infection in selected laboratory and field-collected Stegomyia aegypti (= Aedes aegypti). Med Vet Entomol 2017; 31:312-319. [PMID: 28407282 PMCID: PMC5718633 DOI: 10.1111/mve.12237] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/11/2016] [Revised: 02/13/2017] [Accepted: 03/04/2017] [Indexed: 06/07/2023]
Abstract
Control of dengue virus (DenV) transmission, primarily based on strategies to reduce populations of the principle vector Stegomya aegypti (= Aedes aegypti) (Diptera: Culicidae), is difficult to sustain over time. Other potential strategies aim to manipulate characteristics such as vector competence (VC), the innate capacity of the vector to transmit the virus. Previous studies have identified genetic factors, including differential expression of apoptosis-related genes, associated with the refractory and susceptible phenotypes in selected strains of S. aegypti from Cali, Colombia. The present study was designed to evaluate the variability of VC in selected strains against different DenV serotypes and to determine whether field-collected mosquitoes respond similarly to selected laboratory strains in terms of enhanced or reduced expression of apoptosis-related genes. Vector competence differed between strains, but did not differ in response to different DenV serotypes. Differences in VC were observed among mosquitoes collected from different localities in Cali. The overexpression of the pro-apoptosis genes, caspase 16 and Aedronc, was conserved in field-collected refractory mosquitoes and the selected laboratory refractory strain. The results suggest that the apoptosis response is conserved among all refractory mosquitoes to inhibit the development of all DenV serotypes.
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Affiliation(s)
- I M Serrato
- Biology and Vector Control Unit, Centro Internacional de Entrenamiento e Investigaciones Médicas (CIDEIM), Cali, Colombia
| | - P A Caicedo
- Biology and Vector Control Unit, Centro Internacional de Entrenamiento e Investigaciones Médicas (CIDEIM), Cali, Colombia
| | - Y Orobio
- Biology and Vector Control Unit, Centro Internacional de Entrenamiento e Investigaciones Médicas (CIDEIM), Cali, Colombia
| | - C Lowenberger
- Department of Biological Sciences, Simon Fraser University, Burnaby, Canada
| | - C B Ocampo
- Biology and Vector Control Unit, Centro Internacional de Entrenamiento e Investigaciones Médicas (CIDEIM), Cali, Colombia
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12
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Ocampo CB, Caicedo PA, Jaramillo G, Ursic Bedoya R, Baron O, Serrato IM, Cooper DM, Lowenberger C. Differential expression of apoptosis related genes in selected strains of Aedes aegypti with different susceptibilities to dengue virus. PLoS One 2013; 8:e61187. [PMID: 23593426 PMCID: PMC3622604 DOI: 10.1371/journal.pone.0061187] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2012] [Accepted: 03/07/2013] [Indexed: 01/06/2023] Open
Abstract
Aedes aegypti is the principal vector of Dengue viruses worldwide. We identified field collected insects with differential susceptibility to Dengue-2 virus (DENv-2) and used isofemale selection to establish susceptible and refractory strains based on midgut infection barriers. Previous experiments had identified higher expression of apoptosis-related genes in the refractory strain. To identify potential molecular mechanisms associated with DENv susceptibility, we evaluated the differential expression of Caspase-16, Aedronc, Aedredd, Inhibitor of apoptosis (AeIAP1) and one member of the RNAi pathway, Argonaute-2 in the midguts and fat body tissues of the selected strains at specific times post blood feeding or infection with DENv-2. In the refractory strain there was significantly increased expression of caspases in midgut and fatbody tissues in the presence of DENv-2, compared to exposure to blood alone, and significantly higher caspase expression in the refractory strain compared with the susceptible strain at timepoints when DENv was establishing in these tissues. We used RNAi to knockdown gene expression; knockdown of AeIAP1 was lethal to the insects. In the refractory strain, knockdown of the pro-apoptotic gene Aedronc increased the susceptibility of refractory insects to DENv-2 from 53% to 78% suggesting a contributing role of this gene in the innate immune response of the refractory strain.
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Affiliation(s)
- Clara B. Ocampo
- Centro Internacional de Entrenamiento e Investigaciones Médicas (CIDEIM), Cali, Colombia
| | - Paola A. Caicedo
- Centro Internacional de Entrenamiento e Investigaciones Médicas (CIDEIM), Cali, Colombia
| | - Gloria Jaramillo
- Centro Internacional de Entrenamiento e Investigaciones Médicas (CIDEIM), Cali, Colombia
| | - Raul Ursic Bedoya
- Department of Biological Sciences, Simon Fraser University, Burnaby, British Columbia, Canada
- Tekmira Pharmaceuticals Corporation, Burnaby, British Columbia, Canada
| | - Olga Baron
- Centro Internacional de Entrenamiento e Investigaciones Médicas (CIDEIM), Cali, Colombia
- Université Nice Sophia Antipolis, Nice, France
| | - Idalba M. Serrato
- Centro Internacional de Entrenamiento e Investigaciones Médicas (CIDEIM), Cali, Colombia
| | - Dawn M. Cooper
- Department of Biological Sciences, Simon Fraser University, Burnaby, British Columbia, Canada
- Department of Cellular and Physiological Sciences, University of British Columbia, Vancouver, British Columbia, Canada
| | - Carl Lowenberger
- Department of Biological Sciences, Simon Fraser University, Burnaby, British Columbia, Canada
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